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Better B&W Conversion Using Multiple Hue/Saturation Layers in Photoshop & Elements
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<blockquote data-quote="WayneF" data-source="post: 354340" data-attributes="member: 12496"><p><strong>Re: Better B&W Conversion Using Multiple Hue/Saturation Layers in Photoshop & Element</strong></p><p></p><p>FWIW, here is a sample why RGB Desaturate is so poor.</p><p></p><p><img src="http://www.scantips.com/g2/grayscale_conversion_result.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Don't know why we automatically assume clever geeks can outsmart the simple Grayscale menu, but decades of clever PhD geeks who actually know have refined the Grayscale menu procedure, to match how human eyes see the color. In Grayscale, we hope to see brighter colors brighter, and darker colors darker.</p><p></p><p>Lab Color is a little like color TV. TV is NOT Lab color, but both use the grayscale Lightness value. (Standard NTSC) Color TV transmitted the regular B&W TV picture (to still be compatible with B&W TV sets), with additional channels about the color hue. Lab Color is a little similar, it uses the Grayscale Lightness value (human eye perception) as one axis, and the a and b axis are the color hue. </p><p>FWIW, the two White Balance sliders (Temperature and Tint) are just the Lab a and b channels (excludes brightness, called Lightness).</p><p></p><p>Anyway, Desaturate of Lab color also retains the same accurate Grayscale menu tones. We could switch to Lab color and then Desaturate, or we could simply use the Grayscale menu provided for this purpose.</p><p></p><p>But Desaturate of RGB color completely destroys it. It just dumps the color without concern how the human eye perceives it.</p><p></p><p></p><p>All I am saying is "Do NOT sell the Grayscale menu short. It is <strong>THE</strong> accurate conversion".</p><p></p><p>But if you don't want accurate, and do want to shift the tones around creatively, that's a different story.</p></blockquote><p></p>
[QUOTE="WayneF, post: 354340, member: 12496"] [b]Re: Better B&W Conversion Using Multiple Hue/Saturation Layers in Photoshop & Element[/b] FWIW, here is a sample why RGB Desaturate is so poor. [IMG]http://www.scantips.com/g2/grayscale_conversion_result.jpg[/IMG] Don't know why we automatically assume clever geeks can outsmart the simple Grayscale menu, but decades of clever PhD geeks who actually know have refined the Grayscale menu procedure, to match how human eyes see the color. In Grayscale, we hope to see brighter colors brighter, and darker colors darker. Lab Color is a little like color TV. TV is NOT Lab color, but both use the grayscale Lightness value. (Standard NTSC) Color TV transmitted the regular B&W TV picture (to still be compatible with B&W TV sets), with additional channels about the color hue. Lab Color is a little similar, it uses the Grayscale Lightness value (human eye perception) as one axis, and the a and b axis are the color hue. FWIW, the two White Balance sliders (Temperature and Tint) are just the Lab a and b channels (excludes brightness, called Lightness). Anyway, Desaturate of Lab color also retains the same accurate Grayscale menu tones. We could switch to Lab color and then Desaturate, or we could simply use the Grayscale menu provided for this purpose. But Desaturate of RGB color completely destroys it. It just dumps the color without concern how the human eye perceives it. All I am saying is "Do NOT sell the Grayscale menu short. It is [B]THE[/B] accurate conversion". But if you don't want accurate, and do want to shift the tones around creatively, that's a different story. [/QUOTE]
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Better B&W Conversion Using Multiple Hue/Saturation Layers in Photoshop & Elements
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